import 'package:flutter/material.dart';
// Hello 小部件
class Hello extends StatelessWidget {
    @override
      Widget build(BuildContext context) {
       
        return Center(
      child: Text(
        'hello',
        textDirection: TextDirection.ltr,
        style: TextStyle(
          fontSize: 40.0,
          fontWeight: FontWeight.bold,
          color: Colors.yellow,
        ),
      ),
      );
      }
}
